Siemens SINUMERIK MC User Manual

To restart the motor safely, the STO must be selected manually and deselected once more.
After the STO has been deselected, a 5 second time window is opened. If the pulse enable
takes place within this time window, the motor starts. If the pulse enable does not take place
within this 5 second time window, the internal STO becomes active once more.
Procedure when the "Feedback signal SSM for pulse inhibit" setting is deactivated
If property "Feedback signal SSM for pulse inhibit" is deactivated (p9509.0 = 1), then SSM
monitoring is exited after pulse cancellation. Status signal "SSM (Speed below limit value)"
goes to 0 (r9722.15 = 0). The SSM monitoring is only reactivated after a new pulse enable. In
this case, STO must not be selected and deselected to start the drive.
Restart after pulse cancellation for p9509.0 = 0
If the drive pulses have been suppressed using OFF1/OFF2/STO, the following steps must be
carried out for a restart:
1. Case
● State after switching on
● SSM active
● STO selected
● Pulse suppression active
● Deselect STO
● The drive enable must be issued within 5 seconds via a positive edge at OFF1, otherwise
STO is reactivated.
2. Case
● Situation
● SSM active
● Motor turning
● OFF1 triggered, pulses are suppressed
● Select STO
● Deselect STO
STO activated internally via pulse suppression: This activation must be undone by se‐
lecting/deselecting STO.
● The drive enable must be issued within 5 seconds via a positive edge at OFF1, otherwise
STO is reactivated.
4.11.1.4 Function diagrams and parameters
Function diagrams
● 2823 SI Extended Functions - SSM (Safe Speed Monitor)
● 2840 SI Extended Functions - SI Motion drive-integrated control signals/status
signals
Safety functions integrated in the drive
4.11 SSM
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB 151

Siemens SINUMERIK MC Specifications

General

Brand	Siemens
Model	SINUMERIK MC
Category	Control Systems
Language	English